Synchronization Of New Modules

When new satellite modules are fitted, these modules have no system time. Transmission of the two system time telegrams allows the module to adopt the system time. This is only possible when the stored system time in the satellite modules is smaller that the time sent.

If the system time in a module is greater than the time sent, (trying a part from another vehicle), the system time is not adopted and an entry is made in the fault memory.

When the SIM or any satellite is replaced, the system time must be entered. As the system time is available in all ISIS modules, it can be transferred into the new module.

This takes place via the Diagnosis Program (Service Functions). To do so, the DISplus/MoDiC requests the system time from all satellites and selects the largest.

The DISplus/MoDiC adds an amount to this time and transmits the result into the new module as the system time. The correction amount compensates for the run time between reading from the satellites and entry in the new module.

This prevents fault messages from the satellites because the system time transferred by the new module is smaller than that stored in the satellites.